Program-controlled variable four-digit microwave one-chip integrated attenuator

Abstract

The invention discloses a program-controlled variable four-digit microwave one-chip integrated attenuator. The attenuator is composed of an input port standing wave adjusting module, a microwave attenuation module, an output port standing wave adjusting module and a control module (21); impedances of all the ports are normalized to 50 ohms; and the ports can be utilized in cascade connection to realize high attenuation. The attenuator provided in the invention has the following advantages that: all attenuation networks are in parallel connection, so that there are few losses on a microwave signal; all control switches and all microwave single-pole single-throw switches employ GaAs field effect transistors, which are extremely small, so that the switch performances are good and a working bandwidth of the attenuator is very wide; an attenuation circuit and a microwave amplitude balancing circuit are in parallel connection, so that the attenuation in a whole working frequency band is substantially balanced and flat; there is no rule for attenuation control coding, so that there is no great influence on results caused by deviation of a certain digit; And introduction of a novel structure enables sensitiveness of the technology to be reduced and a chip yield to be improved from 60% to 80%.

Description

technical field [0001] The invention relates to a microwave single-chip integrated circuit, in particular to a program-controlled variable four-bit microwave single-chip integrated attenuator. Background technique [0002] Digital attenuators are commonly used components in microwave communication systems. A digital attenuator is usually formed by cascading unit attenuation networks with different attenuation quantities, and various attenuation quantities can be realized through the combination of different units, thereby realizing the control and processing of signals. The traditional attenuator uses PIN or GaAs MESFET as the core switch control device. The idea is to achieve unit attenuation by controlling the attenuation network, and then cascade to form the required multi-bit attenuator, and realize the signal through the opening and closing of the switch channel. Attenuation and non-attenuation. And the control code corresponding to the traditional attenuator is a sta...

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Problems solved by technology

And the control code corresponding to the traditional attenuator is a standard binary code. The disadvantages of this attenuator are: (1) When not attenuating, the natural insertion loss of multiple bits is superimposed by multiple bits, resulting in signal loss; (2 ) There is a mismatch between different units, and it is difficult to achieve linear superposition, resulting in low attenuation accuracy; (3) The use of large-size die switches requires high processing accuracy, resulting in low actual yield; (4) Once If a certain bit is shifted, the entire state related to this bit will be shifted, and there is heredity

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